News Details
Non-ionic epoxy paint crosslinking agent
2017-7-28 11:46:32
Non-ionic epoxy paint crosslinking agent
The commonly used epoxy-polyamine additive as a kind of cationic aqueous epoxy crosslinking agent has an adverse effect on film performance and environmental protection due to the use of volatile organic acids. Development of non-ionic epoxy crosslinking agent is one of its development trends.
At present, the preparation process of non-ionic epoxy crosslinking agent is generally more complicated. A new self-emulsified non-ionic epoxy crosslinking agent was synthesized using polyether polyol diglycidyl ether (dgeg), TETA and liquid epoxy resin (EPON828) as raw materials.
In the first place, the chain reaction was carried out in the solution of propylene glycol methyl ether (PM) of TETA, and the hydrophilic flexible polyether chain was introduced in the crosslinking agent. The effects of the material molar ratio (TETA/DGEPG), reaction temperature and reaction time on the conversion rate of the epoxy were investigated.
Then, a further chain reaction was added to the PM solution of EPON828 to TETA - dgeppg addition, which was introduced in the crosslinking agent to improve the compatibility of the crosslinking agent with the epoxy resin. The effects of reaction temperature and reaction time on the conversion rate of EPON828 epoxy were investigated.
Finally vacuum distillation to remove most of the PM after solvent, in 50 ~ 60 ℃ temperature range, add distilled water to the TETA DGEPG - EPON828 adduct, dilute it with solid content is 50% ~ 55%, and the final preparation of a new nonionic since emulsified waterborne epoxy crosslinking agent, its preparation technology is simple.
Experimental results show that the synthesis of a new nonionic waterborne epoxy crosslinking agent has good function of emulsified liquid epoxy resin, and the two-component room temperature which is formed by the liquid epoxy resin crosslinked coating performance is good, has good flexibility and impact resistance, and improved the ordinary epoxy crosslinking performance after the defects of brittle.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The commonly used epoxy-polyamine additive as a kind of cationic aqueous epoxy crosslinking agent has an adverse effect on film performance and environmental protection due to the use of volatile organic acids. Development of non-ionic epoxy crosslinking agent is one of its development trends.
At present, the preparation process of non-ionic epoxy crosslinking agent is generally more complicated. A new self-emulsified non-ionic epoxy crosslinking agent was synthesized using polyether polyol diglycidyl ether (dgeg), TETA and liquid epoxy resin (EPON828) as raw materials.
In the first place, the chain reaction was carried out in the solution of propylene glycol methyl ether (PM) of TETA, and the hydrophilic flexible polyether chain was introduced in the crosslinking agent. The effects of the material molar ratio (TETA/DGEPG), reaction temperature and reaction time on the conversion rate of the epoxy were investigated.
Then, a further chain reaction was added to the PM solution of EPON828 to TETA - dgeppg addition, which was introduced in the crosslinking agent to improve the compatibility of the crosslinking agent with the epoxy resin. The effects of reaction temperature and reaction time on the conversion rate of EPON828 epoxy were investigated.
Finally vacuum distillation to remove most of the PM after solvent, in 50 ~ 60 ℃ temperature range, add distilled water to the TETA DGEPG - EPON828 adduct, dilute it with solid content is 50% ~ 55%, and the final preparation of a new nonionic since emulsified waterborne epoxy crosslinking agent, its preparation technology is simple.
Experimental results show that the synthesis of a new nonionic waterborne epoxy crosslinking agent has good function of emulsified liquid epoxy resin, and the two-component room temperature which is formed by the liquid epoxy resin crosslinked coating performance is good, has good flexibility and impact resistance, and improved the ordinary epoxy crosslinking performance after the defects of brittle.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
Solvent - based epoxy coating is harmful to the ecological environment due to its high organic solvents, and the waterborne coatings of epoxy coatings are one of the main trends of its development. Crosslinking agent is one of the key factors affecting the performance of the epoxy coatings in the two components, and the commonly used waterborne epoxy crosslinking agent is mostly the modified product of fatty polyamine.
In epoxy resin - amine adduct more plant-based in the process of the preparation of waterborne epoxy crosslinking agent, because of the reduction hydrophilic aliphatic amine and epoxy resin addition, in order to ensure the crosslinking agent good dispersion in water, commonly used organic acids such as acetic acid and salt, namely into cationic waterborne epoxy crosslinking agent, in order to maintain the stability of the emulsion.
However, the presence of organic acids can lead to the degradation of coating properties, which can be used to create flash rust on metal, and the organic acids can cause pollution to the environment. In addition, cationic water-based water-based epoxy crosslinking agent is sensitive to pH value, and instability occurs when used with alkaline face and filler.
Therefore, the development of non-ionic water-based waterborne epoxy crosslinking agent has broad prospects. At present, there is no literature report on the synthesis of non-ionic waterborne epoxy crosslinking agent. Abroad, although there is a small amount of patent literature report, but its preparation process is generally more complex.
After general epoxy crosslinking performance, on the other hand, brittle, add rubber elastomer or thermoplastic resin to change its brittleness can bring trouble and inconvenience to processing, and with flexible chain segment of crosslinking agent can improve the toughness of epoxy resin crosslinking performance after the defects of brittle.
In this paper, a new non-ionic self-emulsifying waterborne epoxy crosslinking agent is proposed in this paper, and its preparation process is simple. By using polyether polyglycol diglycidyl ether and triethylene tetramine, the teta-dgepg-plus compound was formed, and the hydrophilic flexible polyether chain was introduced in the crosslinking agent.
Then use EPON828 TETA - DGEPG adduct of chain extension reaction, crosslinking agent in epoxy resin is introduced into the molecular chains of section, to improve the compatibility of crosslinking agent and liquid epoxy resin, the epoxy crosslinking agent has the function of the emulsification liquid epoxy resin.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Solvent - based epoxy coating is harmful to the ecological environment due to its high organic solvents, and the waterborne coatings of epoxy coatings are one of the main trends of its development. Crosslinking agent is one of the key factors affecting the performance of the epoxy coatings in the two components, and the commonly used waterborne epoxy crosslinking agent is mostly the modified product of fatty polyamine.
In epoxy resin - amine adduct more plant-based in the process of the preparation of waterborne epoxy crosslinking agent, because of the reduction hydrophilic aliphatic amine and epoxy resin addition, in order to ensure the crosslinking agent good dispersion in water, commonly used organic acids such as acetic acid and salt, namely into cationic waterborne epoxy crosslinking agent, in order to maintain the stability of the emulsion.
However, the presence of organic acids can lead to the degradation of coating properties, which can be used to create flash rust on metal, and the organic acids can cause pollution to the environment. In addition, cationic water-based water-based epoxy crosslinking agent is sensitive to pH value, and instability occurs when used with alkaline face and filler.
Therefore, the development of non-ionic water-based waterborne epoxy crosslinking agent has broad prospects. At present, there is no literature report on the synthesis of non-ionic waterborne epoxy crosslinking agent. Abroad, although there is a small amount of patent literature report, but its preparation process is generally more complex.
After general epoxy crosslinking performance, on the other hand, brittle, add rubber elastomer or thermoplastic resin to change its brittleness can bring trouble and inconvenience to processing, and with flexible chain segment of crosslinking agent can improve the toughness of epoxy resin crosslinking performance after the defects of brittle.
In this paper, a new non-ionic self-emulsifying waterborne epoxy crosslinking agent is proposed in this paper, and its preparation process is simple. By using polyether polyglycol diglycidyl ether and triethylene tetramine, the teta-dgepg-plus compound was formed, and the hydrophilic flexible polyether chain was introduced in the crosslinking agent.
Then use EPON828 TETA - DGEPG adduct of chain extension reaction, crosslinking agent in epoxy resin is introduced into the molecular chains of section, to improve the compatibility of crosslinking agent and liquid epoxy resin, the epoxy crosslinking agent has the function of the emulsification liquid epoxy resin.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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